A situation caused by two or more processes being unable to proceed (and thus release their locks) because they are blocked by locks on resources held by the other process.

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How I prevent deadlock occurrence in my application?

I am developing an LMS application in PHP framework(Codeigniter 2.1.0). I am using MySQL database. All the tables in the database have innodb engine. I also created indexes on each tables. Now I am ...
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3answers
843 views

Deadlock Error from SQL Server 2000 to SQL Server 2008

After migrating data from SQL Server 2000 to SQL Server 2008, when I am doing any a transaction in the table which find out more row on the database, that's gives me error. Transaction (Process ...
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1answer
563 views

Should an INSERT cause an exclusive lock on a foreign key?

I'm working on a deadlock issue. Process A is doing a simple INSERT into TableA which has a FK to TableB Process B is doing a complicated SELECT on a join that includes TableA and TableB I'll ...
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2answers
945 views

SQL Server 2000 - 'Performance: Deadlock'

We had to restart our SQL Server today, we had made no changes to it. When it came back up we immediately started getting this error from the server DATE/TIME: 2/27/2014 3:09:31 PM ...
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1answer
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Are InnoDB Deadlocks exclusive to INSERT/UPDATE/DELETE?

I am Working around MySQL error "Deadlock found when trying to get lock; try restarting transaction". I am going to have to update a program to allow deadlocks. Is it possible that SELECT statement ...
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Deadlocks in SQL Server

We're currently encountering a problem with out ASP.NET Application that results in deadlocks on the SQL Server database. A bit of background information I can provide is that we rely heavy on AJAX ...
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108 views

Complete deadlock on PostgreSQL 9.3 after removing a numeric id

The problem - complete DB lock after a schema change Architecture I use a PostgreSQL 9.3 with PostGIS to store location updates. The updates are written to two tables - location_updates and ...
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1answer
381 views

Deadlock free MERGE-alike in MySQL?

I am trying to implement some parts of MERGE in the MySQL driver in Drupal. Of course, Drupal has something but in truth it only works because the most frequent MERGE issuer just eats exceptions. So, ...
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754 views

Is Oracle DB immune to the InnoDB deadlocks found in MySQL?

It seems odd to me that MySQL would not handle this internally: "Deadlock found when trying to get lock; try restarting transaction" Does Oracle DB work around this issue? After all, Oracle owns ...
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6k views

How to force the use of row locks?

I am trying to get my table to use row locks. I have already disabled lock escalation. The isolation level is READ_COMMITTED_SNAPSHOT alter table <TABLE_NAME> SET (LOCK_ESCALATION=DISABLE) go ...
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3answers
670 views

Does Snapshot Isolation only give you what has been commited? (And General Snapshot Isolation questions.)

So, I have some deadlocking issues. I have seen two options to resolve it. Add read uncommitted to my db or do Snapshot Isolation and add read committed snapshot. After doing some research into ...
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Oracle 11g see transaction or session start time

I want to know when a session or transaction started. The deadlock file doesn't give me this information. Is there some logfile that keeps these records? I've got a transaction id "TX-1234-abcd", a ...
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Side effects of using updlock lock hint?

I was just exploring UPDLOCK hint in SQL-Server 2008 and I found it is very useful in avoiding certain deadlock scenarios. There are always some side effects when using these types of lock hints but I ...
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2answers
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Lock escalation problem on a trigger

I've inherited a SQL Server 2005 database that is getting 2-3 deadlocks a day. I've tracked it down to a scheduled job that runs during the day and inserts into a table with a trigger. The trigger ...
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votes
2answers
207 views

Deadlock during Slony uninstall and concurrent access of DB

I am using slony1-2.0.4.rc2 and postgresql-8.4.0-0. I faced a deadlock in the slony uninstall process. I was trying to uninstall node from a cluster, as per slony's documents this requires access ...
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70 views

Deadlock best practices

We are running Postgres 9.3, and we have occasional deadlock issues. Currently someone notices and will manually kill off the processes. Is there a best practice in dealing with these when they ...
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2answers
4k views

Deadlock on insert for a table with an insert trigger that updates column in same triggered table

By specification each table uses a guid as the primary key. Another requirement is that each resource requires a 6 number identifier (100001, 100002, ...) as a public id that is unique within the ...
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1answer
2k views

InnoDB : Deadlock from one reader and one writer

This sort of has me miffed. One query is doing a select that includes a table that is undergoing a heavy UPDATE, but that update takes under 1/2 a second, and there are no other writers to that ...
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2answers
4k views

How to handle deadlock issue sql server 2008?

I have a simple application.This application update data of a table (B) from another table(A) which is changed every 60 sec. User may read data at any time so creating deadlock. How is this sort of ...
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1answer
495 views

Locking, deadlocking workaround while process data at the same table

My database has a table: tableX. Task1 makes intensive INSERTs (1000 records per minute) as records to process and very seldom UPDATEs (1-2 records per minute) as records to recalculate. At the ...
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1answer
71 views

Prevent Deadlocks in Vendor Databases

We have a Windows Update (WSUS) database that is used by Windows Update (obviously). A couple of times a day we will receive deadlocks on this database caused by the WSUS application running 2 update ...
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1answer
4k views

SSIS package blocks itself if uses TRUNCATE

There is an SSIS package with Required transaction on the package level and Supported on the tasks level. The main part of the package is deleting the data and inserting new data: Here the Delete ...
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1answer
323 views

All-or-none exclusive lock on 2 SQL tables

My simplistic testing suggested that I can acquire an exclusive lock on 2 tables or postpone acquiring the lock on either until both can be acquired at once by using a query like this: SELECT ...
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1answer
321 views

How can a connection for one DB block a connection to another DB in SQL Server?

We have an interesting scenario. For weeks, we have been experiencing 'outages' on SQL Server 2008 -- where our websites have slowed to a crawl and mass timeouts for all customers who have DB's ...
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1answer
497 views

Stored procedure deadlocking itself

I have a strange situation, seen from the log: Process 37278 waits for ExclusiveLock on advisory lock [16421,999999,12864385,2]; blocked by process 53807. Process 53807 waits for ExclusiveLock on ...
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1answer
577 views

After 5 years of working, SQL Server 2k5 Table now locking without any changes made to DB

I have a table: OrderDetails. For 5 years, only the odd Deadlock has occured. If it happened, it happened on indexes which was on OrderDetails table Now all of a sudden, deadlocks are everywhere - ...
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1answer
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How do you read MySQL InnoDB Monitor output?

I am new to DB Administration. I am trying to figure out the cause of deadlock exceptions, but I am unable to make sense of the logs. The log says that "transaction 1 is rolled back". Why is this the ...
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846 views

SQL Server Deadlock - Two SELECT Exclusive Locks on Exact Same Index and Key [closed]

How is the deadlock graph below possible? How did two SELECT statements simultaneously acquire an exclusive lock on the exact same resource? The exclusive locks were on the primary key index for ...
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3answers
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Why am i getting deadlocks with 1 read and 1 write thread in SQL

if anyone could please help me understand why the following transactions deadlock? I am providing the 2 transactions and the indexes for each table: Transaction 1: SELECT blockId, blockData, ...
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1answer
2k views

Understanding SIX lock in Microsoft SQL-Server

Can somebody explain me how a process can acquire SIX lock on a page? I my deadlock-graph xml file I see that a process running under RC isolation level (executing a select statement at the moment of ...
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2answers
1k views

SQL Server Deadlock Log Entries

We're analysing a deadlock situation on a SQL Server 2005 database and have set the trace flags 1204 and 1222. In the resulting logs we're seeing the following line repeatedly: "Log Viewer could not ...
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1answer
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MySQL InnoDB Deadlock For 2 simple insert queries

I have a deadlock for this two insert queries: insert into PlayerClub (modifiedBy, timeCreated, currentClubId, endingLevelPosition, nextClubId, account_id) values (0, '2014-12-23 15:47:11.596', 180, ...
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2answers
757 views

Deadlock with simple queries in sql server 2008

I have an application that must delete and insert registries from a table, the table is storing the historic registries for an access control and is stored with the datetime for the check in the ...
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1answer
2k views

Deadlocks on same wait resource

I am experiencing a deadlock in SQL Server, but I do not understand why this is a deadlock. It looks like the two resources are actually the same. Meaning that they each have the lock and are asking ...
3
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1answer
121 views

enabling snapshot isolation level on a database - what to monitor?

I am having problems with frequent deadlocks on a subscription database. I am considering enabling the snapshot isolation level for that database. I am aware that there is an overhead on the tempDb ...
3
votes
1answer
161 views

Avoiding Deadlocks

We currently have a trigger-based system in place that does the following: When records in certain tables are modified, a trigger fires that makes a field NULL in a varying number of records in ...
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2answers
1k views

Can I get notification when event occur?

SQL Servers has Traces and XEvents. These are used to capture and analyze what is going on with our SQL Server Instances. Events are stored in the stack for later analysis. For example, If I decide ...
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2answers
744 views

Can 2 tables lock each other if concurrent read/update do not affect same rows? pagelocks off

Can 2 tables cause a deadlock, if the pagelocks are off, and the rows are not related. E.g. Query 1 runs for a few seconds Select * from Orders where CustomerID = 1 and DateOrdered between @D1 and ...
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1answer
135 views

Deadlock between two databases

I have my code running online shared hosting provider. Recently I am seeing too many deadlock exception is being thrown. As you know that shared hosting uses the same database server to host all the ...
3
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1answer
118 views

Understanding & Resolving Deadlock in SQL Server 2008 R2

I am trying hard to figure out what may be going wrong for below shown deadlock graph: I am receiving alerts for deadlocks similar to above for almost every 10 minutes, it's just the query changes, ...
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1answer
698 views

How do I understand this deadlock?

I have two threads doing inserts into a table at the same time, causing a deadlock. The interaction with the table is in a new transaction, so I'm pretty confident there is nothing else going on here. ...
3
votes
1answer
9k views

Oracle 11g hunting down the deadlock, maybe foreign key?

I am trying to understand why a deadlock occurs in my database. The trace tells me that two updates on the same table are locking. In table is the first table to be written to in an transaction, only ...
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2answers
3k views

Preventing mysql deadlocks in your php application that uses SELECT… LOCK IN SHARE MODE

If I understand SELECT ... LOCK IN SHARE MODE correctly, you can place it into a mysql transaction to select the rows you will be working with during that transaction. This is done in order to "lock ...
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1answer
50 views

Dead Locks between an insert ignore and and an update

Using MySQL InnoDB. As far as I know and read so many time dead locks only happens when one transaction is locking resource A and waiting for B and another transaction does the opposite. So with ...
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2answers
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How to handle lock information?

Due to analyzing several deadlocks I used sp_blitzIndex to get an overview about locks. There is a high accordance between the tables (and views) affected by the deadlocks and the tables being ...
3
votes
1answer
86 views

sql server deadlock error - Shared (S) and Intent-Exclusive (IX) locks under Serializable isolation

Deadlock errors such as below happen frequently on our 3rd party vendor database: <?xml version="1.0" encoding="utf-8" ?> - <deadlock-list> - <deadlock victim="process743288"> ...
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1answer
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MySQL: Alter Table on very active table gives “Waiting for table metadata lock”

At my work, we've recently upgraded to MySQL 5.5 and since then, have been bitten a few times by the new (and intended) behavior of metadata locking. Basically, whenever we run an ALTER TABLE ...
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1answer
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PAGELOCK Conversion Deadlock From Update to Intent Exclusive

A customer of ours is experiencing frequent deadlocks. The deadlocks are mostly on the same UPDATE statement. The deadlocks follow a pattern in which both SPIDs have acquired an update (U) lock on a ...
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1answer
2k views

How can I make a select statement get blocked?

Hello I am trying to intentionally make a SQL select statement get blocked by another simple SQL delete or update statement, for the purpose of learning. I prefer only InnoDB tables. To prepare the ...
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1answer
786 views

How this simple Stored Procedure ended up in Deadlock

Thanks for all and this forum is really helpful. After few minutes of system running we get “Try restarting the transaction.” And its end up in deadlock. We use MySQL 5.5.28 and the Java code ...